Chapter Contained in this chapter are Figs. Ss is the mapped MCE Ground Motion, 5 percent damped, spectral response acceleration para- meterat shortperiodsas defined in Section S1 is themapped.

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Depending on the definition, equivalent lateral loads will be generated in the horizontal direction s. There are two stages of command specification for generating lateral loads. All vertical coordinates of the floors above the base must be positive and the vertical axis must be perpendicular to the floors. This section directs the engineer to the ASCE code.

The specific section numbers of ASCE 7— those which are implemented, and those which are not implemented—are shown in the table below. The design base shear is computed in accordance with the following equation equation The seismic response coefficient, C s , is determined in accordance with the following equation equation However, C s shall not be less than equation In addition, per equation The following example shows the commands required to enable the program to generate the lateral loads.

Refer to TR. General Format There are two stages of command specification for generating lateral loads. ASCE Chapter LAT f2 The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors.

S1 f5 The mapped MCE spectral response acceleration at a period of 1 second as determined in accordance with Section This is the value used for calculating C s. I f8 Occupancy importance factor. ASCE Clause Enter 1 through 6 in place of A through F, see table below.

ASCE Table PX f13 Optional Period of structure in sec in X-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. PZ f14 Optional Period of structure in sec in Z-direction to be used as fundamental period of the structure. XX f15 Exponent value, x, in X-direction, used in equation ASCE table XZ f16 Exponent value, x, in Z-direction, used in equation FA f17 Optional Short-Period site coefficient at 0.

FV f18 Optional Long-Period site coefficient at 1. Refer to AD. Table 2. Methodology The design base shear is computed in accordance with the following equation equation Example 2 The following example shows the commands required to enable the program to generate the lateral loads.

Parent topic: TR. The zip code of the site location to determine the latitude and longitude and consequently the Ss and S1 factors. The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors. The mapped MCE for 0. The mapped MCE spectral response acceleration at a period of 1 second as determined in accordance with Section Occupancy importance factor.

Long-Period transition period in seconds. Site class. Optional CT value in X-direction to calculate time period. Optional CT value in Z-direction to calculate time period. Optional Period of structure in sec in X-direction to be used as fundamental period of the structure. Optional Period of structure in sec in Z-direction to be used as fundamental period of the structure.

Exponent value, x, in X-direction, used in equation Exponent value, x, in Z-direction, used in equation Optional Short-Period site coefficient at 0. Optional Long-Period site coefficient at 1.

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