contoh perhitungan Tekanan tanah aktif akibat gempa

Tekanan tanah aktif akibat gempa

TEQ    = ½ . H². Ws . kag . B

Diketahui :      H             = 4,00 m

                        B             = 7,72 m

                        Kh           = 0,22

                                     = 30⁰

                        Ws           = 2,65 t/m³

                                k r          = 0,8

          = tan ^-1 ( k r x tan  )

            = tan ^-1 (0,8 x tan 30⁰ )

            = 24,792⁰

          = tan ^-1 ( Kh )

            = tan ^-1 (0,22 )

            = 12,41

Ka       = tan² ( 45 - 24,792 / 2 )

            = 0,409

Kag     = cos² ( Ø-Ø) /  cos²  Ø (1+ √ (sin Ø . sin (Ø-Ø) / (cos Ø) )

            = 0,954 / ( 0,954 (1 + 0,303 ))

            = 0,768

kag    = kag – ka

            = 0,768 – 0,409

            = 0,359

TEQ    = ½ H². Ws . kag . B

            = ½ ( 400 )².2,65 . 0.359 . 7,72 = 58,755 t/m

YEQ    =  x H

            =  x 400

            = 2,66 m

MEQ   = TEQ x YEQ

            = 58,755 x 2,66

            = 156,288 t